Log4j getting size based rolled file, compressed(*.gz)

I am trying to get rolled log file in compressed format but it is not working
with size based rolling policy

log4j configuration i am using is :

log4j.appender.myappLogger=org.apache.log4j.RollingFileAppender
log4j.appender.myappLogger.File=${log_dir}/myapp.log
log4j.appender.myappLogger.MaxFileSize=5MB
log4j.appender.myappLogger.RollingPolicy.FileNamePattern=myapp.%d{yyyy-MM-dd-HH}.log.gz
log4j.appender.myappLogger.layout=org.apache.log4j.PatternLayout
log4j.appender.myappLogger.layout.ConversionPattern=%d %r [%t] %5p %c %x ¬
%m%n

Any suggestions how to achieve this.
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